CN1940750B - Optical scanning device - Google Patents
Optical scanning device Download PDFInfo
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- CN1940750B CN1940750B CN2006101266718A CN200610126671A CN1940750B CN 1940750 B CN1940750 B CN 1940750B CN 2006101266718 A CN2006101266718 A CN 2006101266718A CN 200610126671 A CN200610126671 A CN 200610126671A CN 1940750 B CN1940750 B CN 1940750B
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- toner
- laser beam
- light
- catoptron
- rotary multi
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
- G02B26/124—Details of the optical system between the light source and the polygonal mirror
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/50—Picture reproducers
- H04N1/506—Reproducing the colour component signals picture-sequentially, e.g. with reproducing heads spaced apart from one another in the subscanning direction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
- H04N1/1135—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors for the main-scan only
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Facsimile Scanning Arrangements (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Laser Beam Printer (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Color Electrophotography (AREA)
Abstract
In a scanning optical device which polarization-scans a plurality of fluxes of light by one rotary polygon mirror to form a multi-color image by irradiating beams on a plurality of photosensitive drums, respective, the fluxes of light being incident on the rotary polygon mirror have different angles with respect to a reference plane defined by a normal line of a reflecting surface of the rotary polygon mirror and a rotating direction of the rotary polygon mirror, and a flux of light polarization-scanned at the largest angle between the flux of light and the reference plane is irradiated on a photosensitive drum on which a color image having the highest brightness is formed. With this configuration, a scanning optical device in which a defective image caused by an optical face tangle error can be improved without improving the precision of parts and an image forming apparatus including the scanning optical device are provided.
Description
Technical field
The present invention relates to scanning optical equipment that in the image of electrofax type forms, uses and image processing system with this scanning optical equipment.
Background technology
In the image processing system of electrofax type, by carrying out scanning with the light beam of rotary multi mirror reflects light source, and light beam irradiates on photosensitive drums as the image bearing member that forms electrostatic latent image.In recent years,, also need coloured image strongly even in the image processing system of electrofax type.For this reason, dispose a plurality of photosensitive drums (being generally yellow, magenta, cyan and four photosensitive drums of black).Photosensitive drums is carried out photoscanning to form the toner image of different colours.The mutual superposition toner image is to obtain coloured image.
The coloured image of describing forms in the device in the above, as shown in Figure 7, can use the scanning optical equipment (, only in Fig. 7, showing the reference number of a side) of a plurality of photosensitive drums being carried out photoscanning by the scanning optical equipment conduct of a plurality of laser beam of rotary multi scanning mirror because the scanning optical equipment among Fig. 7 is symmetrical on level.
Scanning optical equipment shown in Figure 7 uses following scheme, and two laser beam incidents make on the both sides of polygonal mirror 28 of a rotary multi catoptron of photosensitive drums exposure to taking on irradiation beam E1 to E4.The light configuration is the oblique incident ray system, and has the configuration of arranging second image formation lens after laser beam is separated from one another.
In this case, in oblique incident ray system shown in Figure 8, when the plane (X-Y plane among Fig. 8) of the sense of rotation definition of the normal of the reflecting surface of polygonal mirror 28 and the polygonal mirror shown in Fig. 9 28 as with reference to face the time, laser beam is to pre-determine angle incident (incident angle will be called " oblique firing angle " hereinafter) about reference surface.Like this, the up and down light path that after the emergent light of polygonal mirror 28, is separated from each other.
Protect scanning optical equipment with protection scanning optical equipment dustproof dustproof glass 32, the loam cake 34 the light box 33 and the top installation dustproof glass 32 of optical element being installed and being sealed light box.
Pass first imaging len 29 from two laser beam that polygonal mirror 28 sends, and reflect downwards with separating the laser beam that refrative mirror 31c will pass photosensitive drums.Because laser beam incides first imaging len 29 with the angle that differs from one another, so construct first imaging len 29 with cylindrical lens.On sub scanning direction, use second imaging len of arranging according to the corresponding light path of laser beam 30 to form image.
Laser beam E2 strides across other laser beam and advances downwards.The light beam that passes layout second imaging len 30 on the way is disposed in the refrative mirror 31b secondary reflection again of the lower surface of light box, and shines on the photosensitive drums by a side of first imaging len 29.In this case, the laser beam E1 that shines on the photosensitive drums two ends just in time transmits below separating refrative mirror 31c with E4, passes second imaging len 30, is shone on the photosensitive drums by refrative mirror 31a then.Configuration separates refrative mirror 31c, makes to prevent that the vignetting (vignetting) of the light beam of two laser beam from appearring in the tolerance because of parts, the disorderly error of light face of polygonal mirror etc.
The scanning optical equipment that uses the oblique incident ray system is the photosystem that can once carry out the polarization scan while holding unit compactness of a plurality of light beams.
But, on the other hand, with oblique firing angle is 0 to be that the photosystem that light beam impinges perpendicularly on the reflecting surface of polygonal mirror 28 is compared, and degenerates (being called " the disorderly error of light face " hereinafter) aspect uneven in the caused gradient of the disorderly error of light face on the oblique incident ray Systems Theory.This is because of the rotating shaft eccentric of reflecting surface about polygonal mirror.
Fig. 9 shows near the beam trajectory the polygonal mirror in the oblique incident ray system.Fig. 9 display beams incides about the state on the polygonal mirror 28 of rotating shaft eccentric d with oblique firing angle α.Usually, cause this off-centre by two factors, i.e. the play that takes place between the turning axle of the fluctuation of polygonal mirror itself and motor and the polygonal mirror 28 (off-centre about the turning axle of the reflecting surface of polygonal mirror will be called " plane off-centre " hereinafter).
As shown in Figure 9, when taking place in the polygonal mirror 28 about the eccentric d in the plane of turning axle, reflecting surface displacement d when polygonal mirror 28 rotates a time so.In the oblique incident ray system, reflection position because of plane off-centre at polygonal mirror 28 top offsets, and light beam is shown in dotted line at the sub scanning direction top offset.As a result, the subscan displacement that has the frequency (gyro frequency of polygonal mirror 28) that equates with the disorderly error of light face.Because disorderly error component of the light face that plane off-centre causes and incident angle worsen pro rata, therefore the disorderly error component of light face must be suppressed to alap level.
In routine techniques,,, can around the turning axle that links polygonal mirror, form a plurality of extensions, and can polygonal mirror be installed by filling out embedding with extension in order to suppress eccentricity component because use the oblique incident ray system.Like this, decide polygonal mirror by filling out build-in, holding screw and screw hole are optional, and have reduced the weight fluctuation (Japanese Patent Application Publication 9-21974 number) of rotation center about the connection polygonal mirror.
As another example, between polygonal mirror and turning axle, play is set, and regulates the plane offset and the disorderly margin of error of light face.With ultraviolet adhesive fixedly polygonal mirror and turning axle, make reduce gradient out-of-flatness etc. (Japanese Patent Application Publication 2004-102006 number) thereafter.
Increase the precision of the turning axle of parts relevant such as polygonal mirror and motor and improve their degree of regulation, make further to reduce the disorderly error of light face with offset.
On the other hand, in some scanning optical equipment of oblique incident ray system shown in Figure 7, polygonal mirror 28 is not carried out polarization scan symmetrically, polygonal mirror is configured in the end of scan light device, to carry out the polarization scan of all light beams on the same level.
Especially, the configuration below in Japanese Patent Application Publication 2004-287237 number, having described.Just, on polygonal same level, carry out the polarization scan of a plurality of light beams, and increase the laser incident angle that forms yellow and black toner image by oblique incidence.
In contrast, in this scanning optical equipment, oblique firing angle must differ from one another so that light beam is separated from one another.For this reason, therefore produce the light path that has greater than the oblique firing angle of other light paths.
When oblique firing angle became big, even the disorderly error of light face is little, the displacement of the light beam that is caused by the disorderly error of light face was greater than the displacement that hour is obtained when oblique firing angle.For this reason, when the light beam with big oblique firing angle makes image bearing member exposure when forming the toner image that is made of the toner with low-light level, the color displacement is significant, attracts attention easily because have the toner image of low-light level.
Summary of the invention
The object of the present invention is to provide scanning optical equipment, it reduces to cause influence to image when a plurality of light beams are oblique when being mapped on the same level of rotary multi catoptron by the disorderly error of light face.
Image processing system of the present invention comprises: be scanned into the rotary multi catoptron of a plurality of laser beam that are mapped on the same level, wherein at least some of a plurality of laser beam about with the vertical plane of the turning axle of rotary multi catoptron with different angle incident; And sub-image bearing carrier, incide laser beam lithography image on the rotary multi catoptron in order to the turning axle of rotary multi catoptron with perpendicular to the minimum angles between the plane of the turning axle of rotary multi catoptron thereon, and the toner that has minimum brightness in the toner color to be developed with other laser beam lithographies on the same level that the incides the rotary multi catoptron described sub-image that develops.
To from following explanation, understand other purpose of the present invention.
Description of drawings
Fig. 1 is the figure sectional view of the configured in one piece of explanation image processing system.
Fig. 2 is the sectional view of the scanning optical equipment on explanation illumination beam to four photosensitive drums.
Fig. 3 is the sectional view of the scanning optical equipment on explanation illumination beam to six photosensitive drums.
Fig. 4 is that explanation is by using the sectional view of three scanning optical equipment with the scanning optical equipment on light beam irradiates to six photosensitive drums.
Fig. 5 is that explanation is by using the sectional view of two scanning optical equipment with the scanning optical equipment on light beam irradiates to six photosensitive drums.
Fig. 6 is the sectional view of the scanning optical equipment of explanation by having two scanning group with the scanning optical equipment on light beam irradiates to six photosensitive drums.
Fig. 7 is the sectional view of explanation according to the scanning optical equipment of routine techniques.
Fig. 8 is the planimetric map of explanation according to the scanning optical equipment of routine techniques.
Fig. 9 is the figure of explanation optical axis of acquisition when appearance is centrifugal about the plane of the polygonal mirror of turning axle.
Embodiment
To scanning optical equipment according to embodiments of the present invention be described together with the image processing system that comprises scanning optical equipment below.
[first embodiment]
Below with reference to scanning optical equipment and the image processing system of Fig. 1 to Fig. 4 description according to first embodiment.Fig. 1 is the figure sectional view that display image forms the configured in one piece of device, and Fig. 2 and Fig. 3 are the sectional views of explanation scanning optical equipment, and Fig. 4 and Fig. 5 are the sectional views that explanation has the scanning optical equipment of a plurality of scanning group.
(configured in one piece of image processing system)
Form the configured in one piece that the image processing system with scanning optical equipment is described in operation below with reference to Fig. 1 together with image.Fig. 1 shows the image processing system A of printing color image.In image processing system A, four the photosensitive drums 7a to 7d as image bearing member that are arranged to colored i.e. yellow, magenta, cyan and black independently are arranged parallel to each other.Will be for the charging device of photosensitive drums 7a to 7d charging, for the developing apparatus of latent electrostatic image developing etc. is arranged in around the photosensitive drums 7, and with scanning optical equipment B (describing subsequently) be arranged in photosensitive drums 7 below.
In image forms, the scanning optical equipment B of charging will shine corresponding photosensitive drums 7a to 7d according to the laser beam of respective color image respectively and go up to form electrostatic latent image.With the toner sub-image that develops, stack them on the intermediate transfer belt 51 and transfer printing first forms coloured image.The box 52 of slave unit main body below is sent on the recording materials of secondary transfer printing unit by the delivery roll 53 as transmitting device to forming side by side with image with the coloured image secondary transfer printing.In addition, will be transferred to fixing device 54 with the recording materials of toner transfer printing, heating and pressurization are with the photographic fixing toner image.Recording materials be discharged to discharge section 55 thereafter.
(scanning optical equipment)
Irradiation is described as the laser beam of the luminous flux scanning optical equipment B to the photosensitive drums 7a to 7d below with reference to Fig. 2.
In Fig. 2, reference number 1 expression is as the polygonal mirror of the rotary multi catoptron of the polarization scan of carrying out the laser beam of being sent by laser instrument, and reference number 2 expressions form first imaging len of spot image on photosensitive drums 7a to 7d with laser beam.Reference number 3a to 3d represents to form on photosensitive drums together with first imaging len second imaging len of spot image.Second imaging len and first imaging len 2 are called f θ lens jointly.
In scan light system,, the oblique firing angle of all light beams is set differently in order to separate light beam in the back by polygonal mirror 1 polarization scan according to embodiment.For this reason, be used in the cylindrical lens that does not have refractive index on the sub scanning direction and constitute first imaging len 2.
Reference symbol 4a to 4i is that the laser beam of will pass first imaging len 2 reflexes to the refrative mirror on the predetermined direction, and reference number 5 expressions are supported and the light box of fixed light element.
In scanning optical equipment B, give off laser beam from four light sources (light-emitting device), and use all light beams of polygonal mirror 1 polarization scan that are arranged in the end on the direction left in Fig. 2 according to embodiment.At this moment, use identical all light beams of reflecting surface polarization scan of polygonal mirror 1.In the scanning optical equipment B, refrative mirror 4a to 4i is arranged in the way of light path, be directed on the predetermined photosensitive drums 7a to 7d with laser beam polygonal mirror 1 polarization scan.
With polygonal mirror 1 polarization scan light beam, it passes first imaging len 2 as common lens then.Thereafter, with refrative mirror 4a to the 4d folded light beam in the way that is arranged in light path.Folded light beam is passed near second imaging len 3a to 3d the loam cake that is arranged in light box 5 and the dustproof glass 6a to 6d that is attaching loam cake.Respectively with laser beam irradiation to photosensitive drums 7a to 7d.In embodiments, configuration has the light parts as first imaging len, refrative mirror, and second imaging len.
The scanning optical equipment B is such photosystem, and it is maximum wherein making the oblique firing angle of the light path of the photosensitive drums 7d exposure among Fig. 2.For this reason, compare with the disorderly error of the light face of other photosensitive drums 7a to 7c in theory, the disorderly error of the light face on the photosensitive drums 7d is the worst.Oblique firing angle is at the turning axle of reflecting rotating multisurface mirror with perpendicular to the angle between the plane of turning axle (rotation).
In the present embodiment, in theory when image processing system records an image to the photosensitive drums 7d with the disorderly error of the poorest light face and goes up, the color of arranging to have in the employed color maximum brightness.For example, in the image processing system A according to embodiment, four kinds of colors that are arranged on the photosensitive drums 7a to 7d by use are the toner carries out image formation of yellow, magenta, cyan and black.
Usually, the brightness of yellow, magenta, cyan and black reduces successively by described order.Vision sensitivity to image increases with the brightness inverse proportion.More particularly, when the disorderly error of light face is constant, even the image of can vision when black finding out can not vision be found out when yellow.In addition, other colors are that magenta and cyan have by-level.
For this reason, in the scanning optical equipment shown in Fig. 2, with black, cyan, magenta and yellow sequentially being arranged on photosensitive drums 7a, photosensitive drums 7b, photosensitive drums 7c and the photosensitive drums 7d that is arranged in polygonal mirror 1 side.Use this configuration, on the total amount of the disorderly error of light face, obtain combination with optimized image level.More particularly, form on the photosensitive drums of brightness ratio with the image of the higher color of the laser beam of the low-angle polarization scan between laser beam and the reference surface with designated the shining of the laser beam of the wide-angle polarization scan between laser beam and the reference surface.
Have that the laser beam of minimum oblique firing angle is designated to shine on the black with the highest visual sensitivity (having minimum brightness).Like this, the disorderly error of light face is to the influence of black image the little of other color images of comparison that become.
Because it is magenta and cyan have the brightness that almost is equal to each other,, also very little to Effect on Performance even change the position of color.For this reason, can obtain enough preferred image.
Fig. 3 shows the image processing system with six photosensitive drums 8a to 8f.As shown in Figure 3, when the number of photosensitive drums increases, produce the light path of the bigger oblique firing angle that obtains when having than four photosensitive drums of use.For this reason, have according to the scanning optical equipment B of the configuration of embodiment more effective.
In the image processing system of Fig. 3, except that four kinds of colors promptly yellow, magenta, cyan and the black, using two colors with the brightness of almost equal color harmony difference is nattierblue and light magenta (color that has almost equal tone hereinafter will be called the color of same train).
In this case, the scanning optical equipment B also has and follows with reference to identical configuration in the situation of figure 2 explanation.The light path that will have big oblique firing angle is arranged on the color with high brightness, so that can increase image level on the amount of the disorderly error of light face.
For example, from photosensitive drums 8a to 8f, can be by the series arrangement yellow (8a) of descending luminance, light magenta (8b), nattierblue (8c), magenta (8d), cyan (8e) and black (8f).In addition, also very little to Effect on Performance because the color of same train has almost equal brightness in this case even change the order of color, and can obtain enough preferred image.
(brightness measurement method)
The brightness L of the pulverulence of measuring toner will be described below
*Method.
Meet the spectroscope colour difference meter " SE-2000 " (NipponDenshoku Industries Co., Ltd. make) of JIS z-8722 and illuminant-C double vision open country brightness L by use as the toner of light source measurement pulverulence
*Carry out measurement according to subsidiary instruction manual.But the glass by having 2mm thickness and 30mm diameter in powder measurement unit arbitrarily is the standard adjustment of operative norm version preferably.More particularly, in the unit that will fill sample powder (toner) is placed into state on the powdered sample platform (annex) of spectroscope colour difference meter, carry out and measure.Before the unit was placed into the powdered sample platform, the powdered sample that will have 80% or more volume of cell capability was filled in the unit, and powder of per second vibration also continues 30 seconds on shaking table, thereby measures brightness L
*
The number of photosensitive drums is not limited to four or six.Even number is set arbitrarily, carry out and top description identical operations.
When configuration above scanning optical equipment has is even on the oblique same level that is mapped to the rotary multi catoptron of a plurality of light beam, also can reduce the influence of the disorderly error of light face to image.
(second embodiment)
Below with reference to Fig. 4 and Fig. 5 equipment according to second embodiment is described.Because the basic configuration according to the equipment of this embodiment is identical with above-described embodiment, so the repetitive description thereof will be omitted.Configuration as the feature of embodiment will be described below.
Use the scanning optical equipment B of image processing system can make a plurality of photosensitive drums exposures by using the oblique incident ray system.Especially, do not need to make all photosensitive drums exposures with a polygonal mirror.
In Fig. 4, in the image processing system of six photosensitive drums 8a to 8f of configuration, make two adjacent photosensitive drums exposures with a scanning optical equipment B, thereby six photosensitive drums 8a to 8f are exposed with three scanning optical equipment B.In Fig. 5, make three adjacent photosensitive drums exposures with a scanning optical equipment B, thereby six photosensitive drums 8a to 8f are exposed with two scanning optical equipment B.
The oblique incident ray system of above-described first embodiment of each scanning optical equipment utilization.In light-path, the light path that will have big oblique firing angle is arranged to the light path that makes the color exposure with high brightness.
In configuration shown in Figure 4, with the color of same scanning optical equipment B polarization scan same train.For example, with same scanning optical equipment B polarization scan cyan and nattierblue, and with same scanning optical equipment B polarization scan magenta and light magenta.At this moment, the light path that will have little oblique firing angle is arranged to the light path of the laser beam that makes the cyan exposure, and cyan has the color harmony identical with the nattierblue brightness lower than nattierblue.Similarly, the light path that expectation will have a little oblique firing angle is arranged to the light path of the laser beam that makes the magenta exposure, and magenta has with the identical color harmony brightness lower than light magenta of light magenta.
In the same scan group, can make the writing position on the main scanning direction identical.As a result, can form operation with a small amount of colour bits in-migration stabilized image between the same train color.
When using serigraphy to form the image of pure color almost by image processing system, unshowy for the border between the blank that makes image and recording materials, the thin unfertile land of the color of same train is recorded between the line of silk screen or make the image cunning that flattens on the boundary member.For this reason, make the light beam of the color exposure of same train the color displacement occur.The live width of the color of this part seems to have increased.As a result, increased roughness unfriendly.
Described above therewith opposite, according to the configuration of embodiment, can make image form stable operation, and can make the image level under the disorderly margin of error of light face reach best with a small amount of displacement between the color of same train.For this reason, can keep image property superior.
(the 3rd embodiment)
Below with reference to the equipment of Fig. 6 description according to the 3rd embodiment.Because the basic configuration according to the equipment of embodiment is identical with above-described embodiment, so do not describe repeat specification.Configuration as the feature of embodiment will be described below.
In the employed scanning optical equipment of operational version C, the system below using.Just, the both sides of three laser beam incident to polygonal mirrors 10 are so that six photosensitive drums 9a to 9f expose.To the light path of the photosensitive drums 9a to 9f of scanning optical equipment C about polygonal mirror 10 horizontal symmetrical.For this reason, though will be described in the image scanning group A on Fig. 6 the right with reference to figure 6, the image scanning group B in left side has the identical configuration with image scanning group A.
From laser cell (not showing) illuminating laser beam, and with polygonal mirror 10 reflection lasering beams that are arranged in equipment center, on photosensitive drums, to carry out polarization scan.Pass first imaging len 11 by polygonal mirror 10 laser light reflected bundles, and separate and reflection by the refrative mirror 12a to 12e that is arranged on each light path.Then, laser beam is passed the second imaging len 13a to 13c, dustproof glass 14a to 14c, and shines on the corresponding photosensitive drums.
Scanning optical equipment C shown in Fig. 6 is arranged in the light path of arranging the same light element on it among Fig. 6 symmetrically.Light path is defined as scanning group A and scanning group B respectively.In embodiments, with the color of same scan group exposure same train, and in the light configuration of each group, make the laser beam use of the photosensitive drums exposure of development low-light level color have the light path of little angle of light.
In this embodiment, the color of same train is arranged in the identical scanning group because as describe in second embodiment make the writing position on the main scanning direction identical.As a result, can form operation with a small amount of colour bits in-migration stabilized image between the color of same train.
With the reverse direction of the present embodiment on carry out in the scanning optical equipment of polarization scan, and in each scanning group, compare because writing position or magnification be to the influence of each light path, the color displacement between the scanning group on main scanning direction worsens easily.For this reason, the color displacement between the same train color worsens, and the color live width seems to have increased.As a result, increase roughness unfriendly.Therefore, the color of the image that the photosensitive drums that disposes in by Fig. 6 forms is six kinds of colors promptly when yellow, magenta, cyan, black, light magenta and nattierblue, and the color sequences in the embodiment is two kinds of orders that describe below.
Scanning group B → 9a: yellow, 9b: nattierblue, 9c: cyan
Scanning group A → 9d: black, 9e: magenta, 9f: light magenta
Scanning group B → a: yellow, 9b: light magenta, 9c: magenta
Scanning group A → 9d: black, 9e: cyan, 9f: nattierblue
As described above, with the color of same scan group scanning same train, make to allow the writing position on the main scanning direction of color of same train identical, and form with a small amount of colour bits in-migration stabilized image between the color of same train and to operate.As in first and second embodiments, can improve the image level under the disorderly margin of error of the light face of the turning axle of polygonal mirror, and can keep image property superior, and not need to improve the formation of each parts.
(the 4th embodiment)
Below with reference to the equipment of Fig. 6 description according to the 4th embodiment.Because the basic configuration according to the equipment of embodiment is identical with above-described embodiment, so do not describe repeat specification.Configuration as the feature of embodiment will be described below.
System below the scanning optical equipment C that uses in this embodiment utilizes.Just, as the 3rd embodiment of describing in the above, the both sides of three laser beam incident to polygonal mirrors 10, and six photosensitive drums 9a to 9f are exposed.Light configuration of components identical with in the 3rd embodiment.In embodiments, the laser beam that the photosensitive drums that makes a plurality of colors of development same train is exposed is divided into color-set with high brightness and the color-set with low-light level, and respectively with different scanning group exposure photosensitive drums.In the light configuration of each group, make the laser beam use of the photosensitive drums exposure of development low-light level color have the light path of little oblique firing angle.
As in the present embodiment, use the color of different scanning group polarization scan same trains respectively, because the color that has low-light level in same train as the main color of using, as shadow tone, pure color etc., and is often used the color with high brightness auxiliaryly.For this reason, scan the main color of using as much as possible simultaneously with low-light level.In addition, on image, attract attention easily, color is arranged on the light path with little oblique firing angle, make and to improve picture quality because have the color of low-light level.
For this reason, when the color of the image that forms on the photoconductor drums arranged in Fig. 6 is six kinds of colors promptly when yellow, magenta, cyan, black, light magenta and nattierblue, the color sequences in the embodiment is two kinds of orders that describe below.
Scanning group B → 9a: yellow, 9b: magenta, 9c: cyan
Scanning group A → 9d: black, 9e: nattierblue, 9f: light magenta
Scanning group B → 9a: yellow, 9b, magenta, 9c: black
Scanning group A → 9d: cyan, 9e: nattierblue, 9f: light magenta
Configuration above using even write down shadow tone color, pure color etc., also can increase image level.In addition, in the embodiment of describing in the above, can under the amount of the disorderly error of light face of the turning axle of polygonal mirror, increase image level, and can keep image property superior, and need not the essential formation that improves each parts.
(other embodiment)
In the above in the embodiment of Miao Shuing, when six photosensitive drums of configuration, except yellow, magenta, cyan and black, as an example with nattierblue and light magenta.But when four of configurations or more photosensitive drums, not necessarily essential nattierblue and the light magenta used is as the color except yellow, magenta, cyan and black.For example, can use other colors is transparent toner, white powder etc.In this case, transparent toner and white powder do not have brightness or have the brightness higher than yellow.For this reason, can be on light path with big oblique firing angle with these two kinds of color placement, and the order of these two kinds of colors is not designated as permanent order.
In the embodiment of Miao Shuing, in the accompanying drawings, the polarization scan light beam makes light path arrangement above reference surface in the above.But,,, make downward polarization scan light beam so can dispose light path because by the oblique firing angle of the viewpoint definition between light path and the reference surface.In this case, can will have the color placement of minimum brightness on light path with minimum angles.
In the above in the embodiment of Miao Shuing, even change the order of nattierblue with almost equal brightness and light magenta and have the cyan of almost equal brightness and the order of magenta, to Effect on Performance also is very little, thereby can obtain enough superior image.
In third and fourth embodiment, can dispose a plurality of independently scanning optical equipment, and not use scanning group A and B, and in third and fourth embodiment, can carry out photoscanning with the scanning optical equipment that is similar to scanning group A and B.
In addition, the light component configuration in the scanning optical equipment of describing in the embodiment of describing in the above only is an example.But, also can use to obtain other configurations that the face of catching up with is described same effect.
Embodiment of the present invention have been described.But, the invention is not restricted to embodiment, and any modification in the present invention's essence and scope is effective.
The application requires the senior interest of the Japanese patent application formerly submitted on September 2nd, 2005 2005-254725 number, quotes its full content as a reference at this.
Claims (10)
1. image processing system comprises:
A plurality of image bearing members;
A plurality of light sources are used for emission of lasering beam to form electrostatic latent image on each image bearing member;
A plurality of rotary multi catoptrons, it carries out polarization scan to laser beam, and described laser beam incides the rotary multi catoptron with the angle that differs from one another with plane perpendicular to the turning axle of rotary multi catoptron; And
A plurality of developing apparatuss, it utilizes a plurality of toners that the sub-image that forms on described a plurality of image bearing members is developed respectively, and described toner comprises the toner of at least two brightness that have same hue and differ from one another,
Wherein, carry out polarization scan by the common rotary multi catoptron pair laser beam corresponding with toner with same hue,
Wherein, in at least one rotary multi catoptron in described a plurality of rotary multi catoptrons, to by with and described plane between the brightness of inciding the toner that electrostatic latent image that laser beam of rotary multi catoptron forms develops of first angle be higher than to by with and described plane between second angle incide the brightness of the toner that electrostatic latent image that a laser beam of rotary multi catoptron forms develops, second angle is less than first angle.
2. according to the image processing system of claim 1,
The nattierblue toner that wherein said a plurality of developing apparatus utilizes the cyan toner respectively and has the color harmony identical with the cyan toner brightness higher than the brightness of cyan toner develops to the electrostatic latent image on the image bearing member, carries out polarization scan by the common rotary multi catoptron pair laser beam corresponding with cyan toner and nattierblue toner.
3. according to the image processing system of claim 2,
The yellow toner of wherein said a plurality of developing apparatus utilization develops to the electrostatic latent image on the image bearing member,
Wherein carry out polarization scan by the common rotary multi catoptron pair laser beam corresponding with cyan toner, nattierblue toner and yellow toner,
Wherein by from the angle that forms corresponding to the laser beam of the light source of yellow toner and described plane greater than by from the laser beam of the corresponding light source of nattierblue toner and the angle of described plane formation.
4. according to the image processing system of claim 1,
The light magenta toner that wherein said a plurality of developing apparatus utilizes the magenta toner respectively and has the color harmony identical with the magenta toner brightness higher than the brightness of magenta toner develops to the electrostatic latent image on the image bearing member, carries out polarization scan by the common rotary multi catoptron pair laser beam corresponding with magenta toner and light magenta toner.
5. according to the image processing system of claim 4,
The yellow toner of wherein said a plurality of developing apparatus utilization develops to the electrostatic latent image on the image bearing member,
Wherein carry out polarization scan by the common rotary multi catoptron pair laser beam corresponding with magenta toner, light magenta toner and yellow toner,
Wherein by from the angle that forms corresponding to the laser beam of the light source of yellow toner and described plane greater than by from the laser beam of the corresponding light source of light magenta toner and the angle of described plane formation.
6. scanning optical apparatus comprises:
A plurality of light sources are launched corresponding with toner respectively laser beam to form electrostatic latent image on a plurality of image bearing members, and described a plurality of light sources comprise the light source of the laser beam that at least two emissions and the toner with same hue and different brightness are corresponding;
A plurality of rotary multi catoptrons, it carries out polarization scan to the laser beam from light source, and described laser beam incides the rotary multi catoptron with the angle that differs from one another with plane perpendicular to the turning axle of rotary multi catoptron,
Wherein, carry out polarization scan by the common rotary multi catoptron pair laser beam corresponding with toner with same hue,
Wherein, in at least one rotary multi catoptron in described a plurality of rotary multi catoptrons, the angle that forms between described plane and the laser beam corresponding to first toner is greater than the angle that forms between described plane and the laser beam corresponding to second toner, and second toner has the brightness lower than first toner.
7. according to the scanning optical apparatus of claim 6,
Wherein said a plurality of light source comprises and cyan toner and the corresponding light source of nattierblue toner with the color harmony identical with cyan toner brightness higher than the brightness of cyan toner, by common rotary multi catoptron to carrying out polarization scan from the laser beam of the light emitted corresponding with cyan toner and nattierblue toner.
8. according to the scanning optical apparatus of claim 7,
Wherein said a plurality of light source comprises the light source corresponding with yellow toner,
Wherein by common rotary multi catoptron to carrying out polarization scan from the laser beam of the light emitted corresponding with cyan toner, nattierblue toner and yellow toner,
Wherein by from the angle that forms corresponding to the laser beam of the light emitted of yellow toner and described plane greater than by from corresponding to the laser beam of the light emitted of nattierblue toner and the angle of described plane formation.
9. according to the scanning optical apparatus of claim 6,
Wherein said a plurality of light emitted and magenta toner and the corresponding laser beam of light magenta toner with the color harmony identical with magenta toner brightness higher than the brightness of magenta toner are carried out polarization scan by the common rotary multi catoptron pair laser beam corresponding with magenta toner and light magenta toner.
10. according to the scanning optical apparatus of claim 9,
Wherein said a plurality of light source comprises the light source corresponding with yellow toner,
Wherein by common rotary multi catoptron to carrying out polarization scan from the laser beam of the light emitted corresponding with magenta toner, light magenta toner and yellow toner,
Wherein by from the angle that forms corresponding to the laser beam of the light emitted of yellow toner and described plane greater than by from corresponding to the laser beam of the light emitted of light magenta toner and the angle of described plane formation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005-254725 | 2005-09-02 | ||
| JP2005254725A JP4819446B2 (en) | 2005-09-02 | 2005-09-02 | Scanning optical apparatus and image forming apparatus |
| JP2005254725 | 2005-09-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1940750A CN1940750A (en) | 2007-04-04 |
| CN1940750B true CN1940750B (en) | 2010-05-26 |
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ID=37829801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101266718A Expired - Fee Related CN1940750B (en) | 2005-09-02 | 2006-09-01 | Optical scanning device |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7629992B2 (en) |
| JP (1) | JP4819446B2 (en) |
| CN (1) | CN1940750B (en) |
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| JP5037885B2 (en) * | 2006-09-19 | 2012-10-03 | 株式会社リコー | Optical scanning apparatus and image forming apparatus |
| JP5388418B2 (en) * | 2007-02-19 | 2014-01-15 | キヤノン株式会社 | Scanning optical apparatus and image forming apparatus |
| JP5219548B2 (en) * | 2008-02-22 | 2013-06-26 | キヤノン株式会社 | Optical scanning device |
| JP2010066679A (en) * | 2008-09-12 | 2010-03-25 | Canon Inc | Scanning optical apparatus and image forming apparatus using the same |
| US8092963B2 (en) * | 2010-01-19 | 2012-01-10 | Xerox Corporation | Toner compositions |
| JP5489073B2 (en) * | 2010-06-02 | 2014-05-14 | 株式会社リコー | Image forming apparatus |
| JP5489074B2 (en) * | 2010-06-18 | 2014-05-14 | 株式会社リコー | Image forming apparatus |
| JP5691528B2 (en) | 2011-01-07 | 2015-04-01 | 株式会社リコー | Optical scanning apparatus and image forming apparatus |
| JP6141074B2 (en) | 2012-04-25 | 2017-06-07 | キヤノン株式会社 | Scanning optical apparatus and image forming apparatus |
| JP2013242547A (en) | 2012-04-26 | 2013-12-05 | Canon Inc | Optical scanner, and image forming apparatus including the optical scanner |
| JP6053314B2 (en) | 2012-04-26 | 2016-12-27 | キヤノン株式会社 | Image forming apparatus |
| JP2014142441A (en) * | 2013-01-23 | 2014-08-07 | Canon Inc | Image forming apparatus |
| JP6786258B2 (en) * | 2015-07-27 | 2020-11-18 | キヤノン株式会社 | Optical scanning device and image forming device equipped with it |
| US9817332B2 (en) * | 2015-07-27 | 2017-11-14 | Canon Kabushiki Kaisha | Optical scanning device and image forming apparatus including the same |
| JP6632393B2 (en) * | 2016-01-25 | 2020-01-22 | キヤノン株式会社 | Image forming device |
| JP2018060092A (en) | 2016-10-06 | 2018-04-12 | キヤノン株式会社 | Optical scanner |
| JP2018132637A (en) | 2017-02-15 | 2018-08-23 | キヤノン株式会社 | Manufacturing method for optical scanning device, optical scanning device, and image forming apparatus |
| JP2018132643A (en) | 2017-02-15 | 2018-08-23 | キヤノン株式会社 | Optical scanner and image formation device |
| JP6882001B2 (en) | 2017-02-15 | 2021-06-02 | キヤノン株式会社 | Optical scanning device and image forming device |
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| JP6840562B2 (en) | 2017-02-15 | 2021-03-10 | キヤノン株式会社 | Optical scanning device and image forming device |
| JP7005150B2 (en) | 2017-02-15 | 2022-01-21 | キヤノン株式会社 | Optical scanning device and image forming device |
| JP6918514B2 (en) | 2017-02-15 | 2021-08-11 | キヤノン株式会社 | Optical scanning device housing and optical scanning device |
| JP6887822B2 (en) | 2017-02-15 | 2021-06-16 | キヤノン株式会社 | Optical scanning device and image forming device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2007065565A (en) | 2007-03-15 |
| US7629992B2 (en) | 2009-12-08 |
| JP4819446B2 (en) | 2011-11-24 |
| CN1940750A (en) | 2007-04-04 |
| US20070053041A1 (en) | 2007-03-08 |
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